Water Quality Alert Update III: Levels of HAAs

The City of Lancaster is continuing to monitor the levels of HAAs in the distribution system. The City is continually monitoring the chlorine levels, to keep the levels low, to prevent the HAAs from forming in the furthest reaches of our distribution system. The City is also continuing the weekly flushing of the affected (Willow Street) area to ensure that we are maintaining the lower levels of HAA. The most recent results for samples taken in the Willow Street area were 0.031mg/L on 02/15/17, and 0.033mg/L on 02/22/17. Both results are still well under the EPA’s maximum contaminant level (MCL) of 0.060mg/L.

After all of the results from first quarter of 2017 (January through March) are received, the City will determine compliance with the MCL. This is done using the running annual average (RAA) for the past four consecutive quarters. Due to the high result from the fourth quarter of 2016, the RAA may still be above the MCL, and public notices might need to be sent again in April.

Updates for the water quality testing will continue to be posted to the City’s website.